linux-kernel - Re: [PATCH v4 00/45] x86: Kernel IBT

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Message-ID: <20220309065718.e4k2el2mlqn23yh2@treble>
Date:   Tue, 8 Mar 2022 22:57:18 -0800
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com
Subject: Re: [PATCH v4 00/45] x86: Kernel IBT

On Tue, Mar 08, 2022 at 12:06:18PM -0800, Josh Poimboeuf wrote:
> As talked about on IRC there are still a few outstanding issues, that
> I'm fine with fixing after the merge window during the upcoming -next
> cycle:
> 
> - xen hypercall page functions need 'ret' - (I think you already fixed)
> 
> - why don't unreachables need to fill up the entire sym hole?
> 
> - get rid of the 'c_file' hack
> 
> - improve cmdline option intuitive-ness
> 
> - properly integrate the retpoline "demotion" with the new Spectre BHI
>   related patches - probably still needs more discussion - for example
>   we might instead want to disable IBT and warn

One more:

- Changing objtool should force a vmlinux re-link.

-- 
Josh